Early Cretaceous ribbed aptychi – a proposal for a new systematic classification

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Měchová, Lucie

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Vašíček, Zdeněk

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Houša, Václav

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2010-07-20T10:45:41Z

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2010-07-20T10:45:41Z

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2010

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Bulletin of geosciences. 2010, vol. 85, no. 2, p. 219-274.

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1214-1119

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1802-8225

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http://hdl.handle.net/10084/78321

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The older system for classification of ribbed calcareous Early Cretaceous aptychi consisted of two genera:
Punctaptychus and Lamellaptychus. Later, I. Turculet divided Lamellaptychus into several subgenera. Within the framework
of both the genera, species and subspecies were distinguished, which resulted in binominal and trinominal nomenclature.
With regard to the richness of newly described species and subspecies in recent years, is not possible to continue
using the original system. It is the basic ribbing that plays the decisive role in the generic and subgeneric classification
of ribbed aptychi. In the case of subspecies systematics, all details on the valve surface are used with the exception
of the sigmoidal bend (fractocostatus) and radial lines (radiatus). The ribbed aptychi are newly divided into the following
families: Punctaptychidae fam. nov. and Lamellaptychidae fam. nov. Within the family Punctaptychidae we are able
to distinguish two genera: Punctaptychus Trauth, 1927 and Cinctpunctaptychus gen. nov. The family Lamellaptychidae
includes five genera differing in the basic arrangement of the ribs: Lamellaptychus Trauth, 1927, Beyrichilamellaptychus
Turculet, 1994, Mortilletilamellaptychus gen. nov., Thorolamellaptychus Turculet, 1994 and
Didayilamellaptychus Turculet, 1994. Eight species and one subspecies are established as new: Cinctpunctaptychus
undulatus, Beyrichilamellaptychus pseudostuderi, Mortilletilamellaptychus mortilletioides, M. submortilleti noricus,
M. stanislavi, Didayilamellaptychus hennigi, D. andrusovi and D. renzi.

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6216368 bytes

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application/pdf

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en

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Česká geologická služba

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Bulletin of geosciences

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http://dx.doi.org/10.3140/bull.geosci.1162

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Late Jurassic

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J/K boundary

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Early Cretaceous

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aptychi

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taxonomy

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new taxa

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Early Cretaceous ribbed aptychi – a proposal for a new systematic classification